Looking for a straightforward way to open and check PST archives when Outlook isn't available? The PST Viewer helps you how to open PST file without Outlook and shows all your mailbox items in a clear, folder-tree view. It handles very large PST files smoothly without crashing, so you won’t encounter file-size limitations. While this tool is mainly for viewing, it’s a helpful solution when you just want to search old emails, check attachments, or glance through contacts — all without installing Outlook.